This is too technical for a casual user, but the basic idea is: while viewing your own document, open Developer Tools (F12), go to the Network tab, filter by “PDF” or “document,” refresh the page, and look for the source file URL. Again, only do this for content you have the legal right to download.
Websites like YumpuDownloader or general document "leechers" are often used. download yumpu pdf
: If the download button is missing, you can use specialized sites like the Yumpu PDF Downloader . You typically just paste the document URL and click download. This is too technical for a casual user,